Supplanaxis nucleus, common name the black Atlantic planaxis, is a species of small sea snail, a marine gastropod mollusk in the family Planaxidae. Distribution This species occurs in the Caribbean Sea, the Gulf of Mexico and off the Lesser Antilles. Description The maximum recorded shell length is 17 mm. Habitat Minimum recorded depth is 0 m. Maximum recorded depth is 3 m. References Rosenberg, G.; Moretzsohn, F.; García, E. F. (2009). Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579–699 in: Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Texas A&M Press, College Station, Texas. External links Planaxidae Gastropods described in 1789